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to slack off after a period of doing a reasonably acceptable job in an activity.
athletic kid: come on! only 5 more miles!

fat kid: fuck that!

athletic kid: dont let up on me now!
let up by domiyan December 4, 2012
Related Words
When you expect worse than what actually happens. A pessimist's let down. Can cause happiness and joy, or the anger and frustration brought by a let down.
I seriously expected to do worse on my test. God, what a let up!
let up by aslan8 December 16, 2005
Letum is obviously a good luck charm when attached to the bottom of a post, perhaps a troll repellent or a buffer against future flaming would be bought on by this seal of Letumness. So from this day forth all posts should be signed with Letum to encourage wealth and well being for all.

Letum is also Latin for Death.
This thread sucks.

Letum
letum by LotteSS December 11, 2005
IRC instigator. annoying person with a penchant for pushing buttons and interjecting in conversations for no reason.
/ignore litup ftw!

11:47 * Hayrab sets mode: +b litup
litup by JonnyPhenomenon July 15, 2008

Beep beep letus 

When sitting in awkward silence it is the perfect time to yell "beep beep letus"
*awkward silence*

Him-"BEEP BEEP LETUS"
Her-we are on a date could you shut it? -_-
letuc is something you would say to someone who is an asshole. It means asshole
letuc by Dennis/Hans April 22, 2005